11.04¢
per kWh, 2025
[ Washington-St Tammany E C / LA ]
Washington-St Tammany E C electricity rates in Louisiana
CO-OP BOARD SETS RATES · DATA 2025
change in average rate, 2024→2025
−6.8%
vs 2024
51,187
residential customers
+20.9%
since 2020
What your bill becomes
Bill today
No change on file
Difference / month · / year
Estimated at Washington-St Tammany E C's average effective residential rate (11.04¢/kWh, EIA, all charges included). Your tariff, fees and taxes differ.
Rate history 2015–2025
| Year | ¢/kWh | Change | Customers |
|---|---|---|---|
| 2015 | 9.19¢ | — | 46,826 |
| 2016 | 9.49¢ | +3.3% | 47,270 |
| 2017 | 9.54¢ | +0.5% | 46,826 |
| 2018 | 9.39¢ | −1.6% | 48,182 |
| 2019 | 9.56¢ | +1.8% | 48,578 |
| 2020 | 9.13¢ | −4.5% | 49,012 |
| 2021 | 9.62¢ | +5.4% | 49,651 |
| 2022 | 11.06¢ | +15.0% | 50,076 |
| 2023 | 10.76¢ | −2.7% | 50,577 |
| 2024 | 11.85¢ | +10.1% | 50,901 |
| 2025 | 11.04¢ | −6.8% | 51,187 |
How this compares
12.52¢
Louisiana average, 2025
−11.8%
Washington-St Tammany E C vs LA 2025 average
−35.9%
vs US 2025 average
#16
priciest in LA
Serves 3 counties in Louisiana: St Tammany, Tangipahoa, Washington. 40 ZIP codes.
What the numbers show
Since 2015, Washington-St Tammany E C's average residential rate has gone from 9.19¢ to 11.04¢ per kWh: +20.1% over 10 years, or about +1.9% a year. It rose in 6 of the 10 years we can compare, and the biggest one-year increase was +15.0% in 2022. The largest drop was −6.8% in 2025.
For a home using 1,225 kWh a month, the Louisiana average, Washington-St Tammany E C's 2025 rate works out to about $1,623 a year, $218 less than at Louisiana's average rate of 12.52¢. Of the 20 Louisiana utilities in our data with a 2025 price, it is the 16th most expensive.
Washington-St Tammany E C served 46,826 homes in 2015 and 51,187 in 2025 (+9.3%), about 2% of Louisiana's residential electricity customers.
Who sets Washington-St Tammany E C's rates
Washington-St Tammany E C is a member-owned electric cooperative. A board elected by its members sets its rates. In some states the Louisiana Public Service Commission also reviews co-op rates, but most co-op rate changes do not go through a commission rate case, so watch the co-op's own member notices and board meetings.
Commission contact: Louisiana Public Service Commission. How we calculate every figure on this page: methodology.
Questions
Is Washington-St Tammany E C raising rates in 2026?
Washington-St Tammany E C's rates are set by its member-elected board, not through a rate case at the Louisiana Public Service Commission, so check its own notices for a change this year. Its average residential rate moved −6.8% from 2024 to 2025.
What does Washington-St Tammany E C charge per kWh?
Washington-St Tammany E C's average effective residential rate was 11.04¢ per kWh in 2025 (EIA-861, revenue divided by sales, all charges included). Louisiana's 2025 average was 12.52¢.
How much have Washington-St Tammany E C rates gone up in five years?
+20.9% between 2020 and 2025, against +16.7% for Louisiana as a whole over the latest five-year window.
How many customers does Washington-St Tammany E C have in Louisiana?
51,187 residential customers in 2025, across 3 counties including St Tammany, Tangipahoa, Washington, according to the EIA-861 survey.
Where do these numbers come from?
Rates and customer counts are from the US Energy Information Administration's annual EIA-861 survey, which every US utility files. Nothing here is a utility bill; use it to understand the direction and size of changes.
Sources
- EIA-861 Sales to Ultimate Customers, 2015–2025 (released 2026-10-07)
- EIA-861M monthly state averages through Jul 2026
- NREL utility-by-ZIP lookup (2024)